JPMorgan, Wells Fargo, Goldman Sachs and Citi kicked off earnings season on Wednesday with their December-quarter results.

Some of Wall Street’s biggest banks reported a surge in profit today on the back of a rebound in dealmaking and strengthening equity markets toward the end of last year. JPMorgan Chase, the US’s biggest lender,

Goldman Sachs said its profit more than doubled in the fourth quarter, boosted by companies’ growing appetite for dealmaking. Profit jumped 105% to $4.11 billion. That amounted to $11.95 per share, which was far better than the $8.